iOS：如何获取两个坐标之间的路径路径 [英] iOS: How to get route path between two coordinates

问题描述

在我的项目中，我需要借助纬度和经度找出两个地点之间的路线。

In my project I've to find out the route path between two locations with the help of latitude and longitude.

我正在使用以下代码

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    [mapvw setDelegate:self];    
    [self mapp];
}


-(void)mapp
{
    CLLocationCoordinate2D coordinateArray[2];
    coordinateArray[0] = CLLocationCoordinate2DMake(28.6129, 77.2295);
    coordinateArray[1] = CLLocationCoordinate2DMake(28.6562, 77.2410);

    self.routeLine = [MKPolyline polylineWithCoordinates:coordinateArray count:2];
    [mapvw setVisibleMapRect:[self.routeLine boundingMapRect]]; //If you want the route to be visible
    [mapvw addOverlay:self.routeLine];
}


-(MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id<MKOverlay>)overlay
{
    if(overlay == self.routeLine)
    {
        if(nil == self.routeLineView)
        {
            self.routeLineView = [[MKPolylineView alloc] initWithPolyline:self.routeLine];
            self.routeLineView.fillColor = [UIColor redColor];
            self.routeLineView.strokeColor = [UIColor redColor];
            self.routeLineView.lineWidth = 3;

        }

        return self.routeLineView;
    }

    return nil;
}

使用此代码我在模拟器上得到这样的输出

With this code I'm getting the output on simulator like this

但是我想要路线图显示道路方向不是直线。
请帮助我解决它在过去2天遇到麻烦
....

But I want the route map which shows direction by road not by straight line. Please help me to solve it i m in trouble from the last 2 days ....

推荐答案

要在两个lat long之间绘制路径，可以使用下面的代码。

To draw path between two lat long, you can use below code.

ViewController.h

#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>

@interface ViewController : UIViewController<MKMapViewDelegate>

@property (strong, nonatomic) IBOutlet MKMapView *myMapView;

@end

ViewController.m

#import "ViewController.h"

@interface ViewController ()

@property (strong, nonatomic) MKPlacemark *destination;
@property (strong,nonatomic) MKPlacemark *source;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.

    [self getDirections];

}

-(void)getDirections {

    CLLocationCoordinate2D sourceCoords = CLLocationCoordinate2DMake(37.773972, -122.431297);

    MKCoordinateRegion region;
    //Set Zoom level using Span
    MKCoordinateSpan span;
    region.center = sourceCoords;

    span.latitudeDelta = 1;
    span.longitudeDelta = 1;
    region.span=span;
    [_myMapView setRegion:region animated:TRUE];

    MKPlacemark *placemark  = [[MKPlacemark alloc] initWithCoordinate:sourceCoords addressDictionary:nil];

    MKPointAnnotation *annotation = [[MKPointAnnotation alloc] init];
    annotation.coordinate = sourceCoords;
    annotation.title = @"San Francisco";
    [self.myMapView addAnnotation:annotation];
    //[self.myMapView addAnnotation:placemark];

     _destination = placemark;

     MKMapItem *mapItem = [[MKMapItem alloc] initWithPlacemark:_destination];

     CLLocationCoordinate2D destCoords = CLLocationCoordinate2DMake(37.615223, -122.389977);
     MKPlacemark *placemark1  = [[MKPlacemark alloc] initWithCoordinate:destCoords addressDictionary:nil];

    MKPointAnnotation *annotation1 = [[MKPointAnnotation alloc] init];
    annotation1.coordinate = destCoords;
    annotation1.title = @"San Francisco University";
    [self.myMapView addAnnotation:annotation1];

    //[self.myMapView addAnnotation:placemark1];

     _source = placemark1;

     MKMapItem *mapItem1 = [[MKMapItem alloc] initWithPlacemark:_source];

     MKDirectionsRequest *request = [[MKDirectionsRequest alloc] init];
     request.source = mapItem1;

     request.destination = mapItem;
     request.requestsAlternateRoutes = NO;

     MKDirections *directions = [[MKDirections alloc] initWithRequest:request];

     [directions calculateDirectionsWithCompletionHandler:
      ^(MKDirectionsResponse *response, NSError *error) {
          if (error) {
              NSLog(@"ERROR");
              NSLog(@"%@",[error localizedDescription]);
          } else {
              [self showRoute:response];
          }
      }];
}

-(void)showRoute:(MKDirectionsResponse *)response
{
    for (MKRoute *route in response.routes)
    {
        [_myMapView
         addOverlay:route.polyline level:MKOverlayLevelAboveRoads];

        for (MKRouteStep *step in route.steps)
        {
            NSLog(@"%@", step.instructions);
        }
    }
}

#pragma mark - MKMapViewDelegate methods

- (MKOverlayRenderer *)mapView:(MKMapView *)mapView rendererForOverlay:(id<MKOverlay>)overlay
{
    MKPolylineRenderer *renderer = [[MKPolylineRenderer alloc] initWithPolyline:overlay];
    renderer.strokeColor = [UIColor colorWithRed:0.0/255.0 green:171.0/255.0 blue:253.0/255.0 alpha:1.0];
    renderer.lineWidth = 10.0;
    return  renderer;
}

更新：Swift 4

import MapKit
import UIKit

class ViewController: UIViewController, MKMapViewDelegate {

    var destination: MKPlacemark?
    var source: MKPlacemark?
    @IBOutlet var myMapView: MKMapView!

    func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        getDirections()
    }

    func getDirections() {
        let sourceCoords: CLLocationCoordinate2D = CLLocationCoordinate2DMake(37.773972, -122.431297)
        let region: MKCoordinateRegion
            //Set Zoom level using Span
        let span: MKCoordinateSpan
        region.center = sourceCoords
        span.latitudeDelta = CLLocationDegrees(1)
        span.longitudeDelta = CLLocationDegrees(1)
        region.span = span
        myMapView.setRegion(region, animated: true)
        let placemark = MKPlacemark(coordinate: sourceCoords, addressDictionary: nil)
        let annotation = MKPointAnnotation()
        annotation.coordinate = sourceCoords
        annotation.title = "San Francisco"
        myMapView.addAnnotation(annotation)
        //[self.myMapView addAnnotation:placemark];
        destination = placemark
        var mapItem: MKMapItem? = nil
        if let aDestination = destination {
            mapItem = MKMapItem(placemark: aDestination)
        }
        let destCoords: CLLocationCoordinate2D = CLLocationCoordinate2DMake(37.615223, -122.389977)
        let placemark1 = MKPlacemark(coordinate: destCoords, addressDictionary: nil)
        let annotation1 = MKPointAnnotation()
        annotation1.coordinate = destCoords
        annotation1.title = "San Francisco University"
        myMapView.addAnnotation(annotation1)
        //[self.myMapView addAnnotation:placemark1];
        source = placemark1
        var mapItem1: MKMapItem? = nil
        if let aSource = source {
            mapItem1 = MKMapItem(placemark: aSource)
        }
        let request = MKDirectionsRequest()
        request.source = mapItem1
        request.destination = mapItem
        request.requestsAlternateRoutes = false
        let directions = MKDirections(request: request)
        directions.calculate(completionHandler: {(_ response: MKDirectionsResponse, _ error: Error?) -> Void in
            if error != nil {
                print("ERROR")
                print("\(error?.localizedDescription ?? "")")
            } else {
                self.showRoute(response)
            }
        })
    }

    func showRoute(_ response: MKDirectionsResponse?) {
        for route: MKRoute in response?.routes {
            myMapView.add(route.polyline, level: .aboveRoads)
            for step: MKRouteStep in route.steps {
                print("\(step.instructions)")
            }
        }
    }

    // MARK: - MKMapViewDelegate methods
    func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {
        var renderer: MKPolylineRenderer? = nil
        if let anOverlay = overlay as? MKPolyline {
            renderer = MKPolylineRenderer(polyline: anOverlay)
        }
        renderer?.strokeColor = UIColor(red: 0.0 / 255.0, green: 171.0 / 255.0, blue: 253.0 / 255.0, alpha: 1.0)
        renderer?.lineWidth = 10.0
        if let aRenderer = renderer {
            return aRenderer
        }
        return MKOverlayRenderer()
    }
}

希望它能帮到你！根据您的要求在上面的代码中更改lat。

Hope it will help you out! Change lat long in above code as per your requirement.

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